Multiple pump-controlling device.



H. S. CLARK.

MULTIPLE PUMP CONTROLLING DEVICE.

APPLlCATlON FILED MAR. II. I 9I4.

Patented Mar. 14, 1916.

WITNESSES entree snares @FFEGZEG HORACE S. CLARK, 01E BERKELEY,CALIFORNIA, ASSIGNOR TO THE WESTINGHOUSE AIR BRAKE COMPANY, OFWILMERDING, PENNSYLVANIA, A 'CORPQRATION OF PENNSYLVANIA.

MULTIPLE PUMP-CONTROLLING DEVICE.

masher.

To all whom it may concern:

Be it known that I, HORACE S. CLARK, a citizen of the United States,residing at Berkeley, in the county of Alameda and State of California,have invented new and useful Improvements in Multiple Pump- ControllingDevices, of which the following is a specification.

This invention relates to governingde vices, more particularly for motordriven'air compressors employed on electrically propelled cars. 1

Various devices have heretofore been proposed for eifecting thesimultaneous operation of a plurality of pump governors to cause themotor driven pumps to start and stopworking in synchronism.

The principal object of my invention is to provide improved means forefiecting the simultaneous operation of a plurality of pump governors.

In the accompanying drawing, .the single figure is a diagrammatic viewof an electric motor driven compressor equipment for two cars, showingmy improvement applied thereto.

The pump governor shown in the drawing is somewhat similar to theconstruction covered by Patent No. 834,274 of E. H. Dewson, datedOctober 30, 1906, and comprises a cyl inder 1 having a piston chamber 2containing a piston 3, subject on one side to the pump pressure admittedthereto through pipe 4-. The piston 3 has a piston rod 5 carrying adouble contact member 6 and surrounding the piston rod is a spring 7 thepressure of which is adapted-to be regulated by means of an adjustable.plate 8. Adjacent to the cylinder 1 and surrounding the piston rod 5 isa coil 9 of an electro-magnet. In the closed position, the contactmember 6 connects contacts 10 and 11, the contact 11 being connected bywire 12' with the main conductor 13 and the contact 10 with one terminalof coil 9. The other terminal of "coil 9 is connected by wire 14 to themotor of the motor compressor 15 and a wire 16 con-- nects the otherterminal of the motor with main conductor 17. Each motor compressorSpecificatioirof Letters Patent.

Patented Mar. ta, rare.

Application filed March 11, 191%, Serial No. 824,036.

As so far described, the operation is as follows: When the pressure inthe main reservoir 18 and in the piston chamber 2 has reduced to apredetermined minimum degree, according to the adjustment of theregulating spring ,7, the spring 7 forces the contact member 6 intoengagement with the contacts 10 and 11. The circuit through the coil 9and the compressor motor is thus closed and the energization of theelectromagnetdraws the armature 20 inwardly with a jerk, thus insuringimmediate and complete engagement of thecontacts. As the main reservoirpressure increases by operation of the compressor, the pressure on thepiston 3 also increases until the pressure is sufficient to overcome thepressure of the spring 7 and the holding power of the electro-magnet,then the contact member is moved out by the piston 3 and the contactsare separated. The electro-magnet is then denergized, so that the fullforce of the fluid pressure in piston chamber 2 opposes the springpressure only and a quick opening movement of the contacts is thereuponeffected. According to my improvement the terminal 10 of the compressorgovernor on one car is connected by a wire 21 to the terminal 10 of thegovernor on another car. With this connection, when the pump pressurehas reduced to a degree at which one of the pump governors cuts in, thecompressor motor circuit on thatcar is closed in the usual way asheretofore described and in addition, a circuit is also completed fromthe main conductor 13 through wire 12, contact 11, contact member 6 andcontact 10 on said car, through wire 21 to. contact 10 on the other carand thence through coil 9, wire 14, the compressor motor, and wire 16 tothe main conductor 17. The electro-magnet of the compressor governor onthe other car is thus energized and thus operates to draw the armature20 inwardly and thereby the contact member 6 to close the circuitthrough contacts 10 and'll, so thatcurrent is supplied to the motorcompressor on this car from the main conductors simultaneously with thestarting of the motor compressor on the first car. If desired, a secondwire 22 may be'connected across the wires 14 of the two cars, so as toprovide a direct circuit without the necessity of completing the circuitthrough the motor of the second car. In other words, when'the wire 22 isemployed, and one of the compressor governors cuts in, both coils 9 arein circuit in parallel.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. The combination with two electric pump governors each comprising anelectric switch for controlling-the pump motor circuit and anelectro-magnet adapted upon energization to exert its ower to close theswitch, of a wire connecting the electro-magnet of one pump governorwith the electromagnet of the other pump governor.

2. The combination with two electric pump governors each comprising anelectric switch for controlling the pump motor circuit, a piston subjectto pump pressure for operating said switch, and an electromagnet inseries with the pump motor and exerting its pull upon energization toclose the electric switch, of a wire connecting the electro-magnet ofone pump governor with that of the other pump governor.

3. The combination with two electric pump governors each comprising anelectric switch for controlling the pump motor circuit, a piston subjectto pump pressure for operating said switch, and an electromagnet havinga coil connected in series the pump motor circuit and adapted whenenergized to assist in closing the switch, of a wire connecting theelectro-magnet. coil of one pump governor with that of the other tothereby effect the energization of the electro-magnet and the closure ofthe electric switch of the last mentioned governor.

4. The combination with two electric pump governors each including anelectric switch for opening and closing the pump motor circuit and anelectro-magnet having a coil connected in the pump motor circuit andadapted upon energization to assist in l closing the switch, of a wireconnecting similar terminals of the electro-magnet coils to therebyeffect the energization "of one coil upon energization of the other.

In testimony whereof I have hereunto set myhand.

HORACE S. CLARK.

Witnesses:

S. G. CoUN, A. F. PE'rERsoN.

